Campo Oeste ("West Camp", also called Campo Tepeyác, with 15 buildings) is a small community of abalone and lobster fishermen, located on the western coast, specifically on the north side of West Anchorage, a bay that provides protection from the strong winds and swells that whip the islands during winter. Generators provide electricity, and a military vessel brings 20,000 liters of fresh water. The number of fishermen varies annually depending on the fishing season. 10 Months of the year the 30 families of the fishing cooperative "Abuloneros and Langosteros of Guadalupe Island" are present.

An abandoned fishermen community, Campo Este ("East Camp"), is located near a cove on the eastern shore.

At the southern tip, on Melpómene Cove, there is a weather station staffed by a detachment from the Mexican Ministry of the Navy. The site is called Campamento Sur ("South Encampment").

Campo Bosque was established as a temporary camp in 1999 in the cypress forest in the north. The camp houses members of the Cooperative Farming Society "Francisco Javier Maytorena, S.C. of R.L." and removes goats from the island and sells them in the State of Sonora, with permission of SEMARNAT and the support of the Secretariat of the Navy.

Campo Pista is located at the small airport, near the center of the island (elevation:592 m, direction:05/23).

Geography and geology

Guadalupe has a rugged landscape. It consists of two ancient overlapping shield volcanoes, of which the northern and higher volcano is the younger. The island measures 35 km north-south and up to 9.5 km east-west, with a total area of 243.988 km² (94.204 square miles). It features a chain of high volcanic mountain ridges which rises to a height of 1,298 meters (4,257 ft) at its northern end (Mount Augusta). Its smaller counterpart on the southern end is the 975 m (3,199 ft) El Picacho. The southern part of the island is barren, but there are fertile valleys and trees in the northern part. The coast generally consists of rocky bluffs with detached rocks fronting some of them. Two high and prominent islets are within 3 km of the southwestern end of the island, separated from one another by a gap called Tuna Alley:

Islote Afuera (Outer Islet, also Islote Zapato), , 0.015 km², the most distant, steep with almost vertical walls above and below water

Elsewhere, the other islets are very small and close to the shore, all less than one kilometer away:

Islote Negro, , 0.088 km², to the southwest

Roca Hundida, , 0.003 km², to the southwest

Islote Bernal, , 0.011 km², to the southwest

unnamed islet, , 0.005 km², 2 km north of Islote Bernal

unnamed islet, , 0.002 km², 4 km north of Islote Bernal

Steamboat Rock, 0.003 km², to the west

Roca Elefante, 0.001 km², to the northwest (the westernmost)

Climate

The island has two major climate zones: a very arid, semi-hot climate between 0 and 800 meters elevation, with mean annual temperature between 18-22°C, and a very arid, temperate climate above 800 meters elevation with temperatures over 22°C in the hottest month of the year.

Most precipitation occurs over the winter months with strong influence of northwestern winds and cyclones.

Originally brought there in the early 19th century by primarily Russian whalers and sealers for provisions when stopping over, the population eventually eliminated most vegetation; the number of goats declined to a few thousand. The main impact of the goat population was before this collapse, about the turn of the 19th/20th century. Naturalist A.W. Anthony wrote in 1901:

"It is directly due to the despised Billy-goat that many interesting species of plants formerly abundant are now extinct, and also that one or more of the birds peculiar to the island has disappeared, and others are following rapidly.

After the crash, the goat population once again grew, this time more slowly, until it had reached the new, lower carrying capacity at maybe 10,000–20,000 in modern times. The island had been a nature conservancy area since August 16, 1928, making it one of the oldest reserves in Mexico. Eradication of the goats was long envisioned, but logistical difficulties such as island size and lack of suitable spots for landing and encamping hunters and material prevented this. As of June 2005, after many years of false starts, the Mexican government has almost completed a round-up and evacuation of the remaining goat population and Guadalupe has been designated a biospherereserve.

Of the large tree species on Guadalupe Island (Guadalupe Palm, Guadalupe Cypress, Island Oak, and Guadalupe Pine), there were only old individuals left; California Juniper had entirely disappeared. As the goats ate any seedlings that managed to germinate, no regeneration of trees was possible. Water, formerly plentiful as the common fogs condensed in the forests of the northern end of the island, today only occurs in a few scattered pools and springs. Because the springs were a critical emergency water supply for the human inhabitants, protective measures including goat fences were installed beginning in 2000, allowing new seedlings of many species to survive for the first time in 150 years. Seacology, a non-profit environmental group located in Berkeley, CA, provided funding to the Island Conservation & Ecology Group for the construction of ten fenced exclosures to keep goats out of the most sensitive areas of Guadalupe Island.

Many island or marinespecies that reside on or near Guadalupe also frequent the Channel Islands, and vice-versa. In stark contrast to the rampant extinction of terrestrial life that happened at the same time, Guadalupe was the last refuge for the Northern Elephant Seal (Mirounga angustirostris) and the Guadalupe Fur Seal (Arctocephalus townsendi) in the 1890s. The island has been a pinniped sanctuary since 1975.

Habitat types

Before the removal of goats, surveys found eight major land habitats on Guadalupe:

Flora of the coastal lowlands and rocky cliffs: mainly up to 200 m above mean sea level (ASL), but higher on the steep cliffs. Largely unresearched due to difficult access, the cliffs might even harbor remnant specimens of the presumably extinct plants.

Guadalupe Palm groves: 400-900 m ASL on the NW side of the island. There are hundreds of palm trees remaining, mainly in a single patch of this habitat. At least one other major palm forest, at the W coast, existed; it was still present in 1906 As reproduction is presumably still ongoing, the species will likely recover in due time.

Guadalupe Cypress forest: 800–1000 m ASL. Presently some 4000 of old trees, essentially limited to the central northern part. Other cypress forests, such as a major stand NE of the present patch which was still extant in 1906, have been destroyed by the goats early in the 20th century. There is still reproduction, but the water table appears to have declined to below the level required by the cypresses, and mortality of the old trees is high and can be expected to continue even after removal of the goats.

Guadalupe Palm - Island Oak - Guadalupe Pine woodland: 900–1000 m ASL. This habitat has all but disappeared during the 20th century, due to the decline in numbers of the oaks and pines.

Guadalupe Pine cloud forest with some Island Oak: restricted to above 1000 m ASL on the N-NE point of the island. The population of the pine has declined by about two-thirds during the last 35 years; it presently stands at about 130 old trees in the main population and about the same number scattered elsewhere. Reproduction is ongoing, with several hundred seedlings having successfully established themselves since 2000, and with the elimination of goat browsing, the pines will likely make a full recovery. The situation of the oak is more dire; there are only 20 trees or so remaining (by about 1950, there were 100) and they appear past reproductive age. Not being restricted to Guadalupe, seedlings could be imported from elsewhere.

A ninth habitat type, California Juniper woodland and extending on the central plateau below the cypress forest, was entirely gone by 1906. What other endemic lifeforms underwent coextinction with it will forever remain unknown.

Extinctions

Numerous taxa have gone extinct due to the habitat destruction by the goats, which in turn rendered the endemic fauna vulnerable to predation by introduced cats and to adverse weather by depriving them of shelter.

There have been 5-6 extinctions of birds:

Guadalupe Bewick's Wren (Thryomanes bewickii brevicauda), late 1890s? A date of 1903 is often given, but this seems to be in error.